Features

• 20 ppi ultra-coarse Filter Foam provides both mechanical and biological filtration for cleaner, healthier water for your aquarium inhabitants
• This is replacement foam for the main filter unit of the BioMaster
• Timing to replace the filter foam varies upon aquarium size and the number of fish and plants. We recommend replacing the foams incrementally.
• The 20 ppi foam is a replacement foam for the BioMaster 250, BioMaster Thermo 250, BioMaster 350, BioMaster Thermo 350, BioMaster 600, or BioMaster Thermo 600